The United States. All the answers above are technically correct. Lincoln signed off on all of the U.S. The other answers just include parts of the U.S. instead of the whole :)
B. It reunited northern and southern China in the sixth century.
The Sui Dynasty was a relatively short one, it only lasted from 589 AD to 618 AD. Therefore, A. C. and D. are incorrect because the Dynasty was not in power at those times. So, B is correct because it did reunite northern and southern China with its creation in the 6th century.
Below are the choices that can be found elsewhere:
They enacted laws protecting whites from discrimination.
<span>They made it nearly impossible for minorities to vote. </span>
<span>They desegregated all public and private businesses. </span>
<span>They were able to overturn the Fifteenth Amendment.
</span>
The answer is "They made it nearly impossible for minorities to vote." <span>The Civil Rights Act of 1965 made voting possible for everyone. I hope it helps. </span>
The Civil Rights Act of 1964